Another thing I'd suggest, don't force her to go to big events/parties/social occasions if she doesn't want to.
I would dread any event involving having to speak to multiple people. I'd dread it, hate it while it was happening, and then afterwards feel sad because I felt like I have acted correctly/performed a certain way. And I'd see more worry and disappointment in my mum after these too. She'd be obviously concerned and sad that I hadn't enjoyed these occasions that kids are supposed to enjoy - like parties, fetes, discos, big days out with lots of other people.
But I wasn't experiencing what other kids were, to me these occasions were too much noise, too many people, lots of stuff happening at the same time, massive sensory overload. I couldn't process it to enjoy it, or even figure out why it was supposed to be enjoyable. Anything with more than 5 people around was an overload to me.
But when I was with 1 or 2 people I was often ok and enjoyed it. Things like visiting a farm or zoo on a quiet day, going for a walk in a quiet forest. Things that didn't involve too many different voices or people I had to interact with.
I would just shut down inside at big events. I still hate them now. But I LOVE a gorgeous hike in nature with a couple of other people, nice dinners and wine tasting with my DH, museums, going to nature reserves and seeing animals in the wild.
Just quieter things with less people and less sensory madness.
She will find things that make her super happy, just don't try to stick a square peg in a round hole.